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Change position every 3rd frame
Hello,
I have a layer which I animate between 2 position keyframes.
I would like this layer to move from one position key to the next, by changing its position not every frame, but once every 3 frames.How can I achieve this?
Thanks,
Yaron. -
8 Replies
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frameInterval = 3;
fps= 1.0 / thisComp.frameDuration;
posterizeTime(fps/frameInterval);
value;Lloyd
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I don’t understand how to use this expression.
I need to keep the position between the 2 keyframes I set already, only to make the transition between them occur instead of every single frame – every 3rd frame.
By the way, is there a way to populate the entire timeline between 2 keyframes with keyframes automatically ? (instead of scrolling forward every frame and adding a keyframe)
At least a way to set a shortcut to ‘Add Keyframe’ ?
Thanks.. Yaron.
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You need to apply that expression to the position property. Alt-click on the timewatch icon for position and copy and paste the expression into the text field that opens.
The shortcut to add a keyframe for position is Alt-P
-Lloyd
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As I recall, posterizeTime() can be a little temperamental in CS4, so if you can’t get it to work, you could try it this way:
t = framesToTime(Math.floor(timeToFrames()/3)*3);
valueAtTime(t)For creating keyframes at every frame, you can create the default expression (Alt+click the stopwatch) then use Animation>Keyframe Assistant>Convert Expression to Keyframes. Then you may want to delete the keyframes before and after your span of interest.
Dan
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Hey Dan,
What do you mean by temperamental? I’ve never had any issues with posterizeTime.
-Lloyd
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Mostly it doesn’t work. I just tried this on a keyframed solid’s position in a 30fps comp:
posterizeTime(10);
value;It doesn’t have any effect. This is only CS4 I’m talking about.
Dan
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Wow! you are right, when I tested the expression i posted in this thread I did it in CS5 and it worked fine but when I just tried it in CS4 it doesn’t work. I can’t believe I didn’t know about this, thanks for pointing it out. I am assuming that since it is fixed in CS5 it was a known bug.
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Yeah, somebody here ran into it last year some time. I reported it in case no one else had.
Dan
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